Algal protein, derived from various microalgae such as Spirulina and Chlorella, has garnered interest in skin care primarily due to its rich content of amino acids, antioxidants, vitamins, and minerals. Scientific studies have identified that these bioactive compounds can provide antioxidant and anti-inflammatory benefits, which may help protect the skin from oxidative stress and support skin barrier function. Some in vitro and animal studies have demonstrated that algal extracts can reduce markers of skin inflammation, enhance hydration, and promote wound healing. For example, research published in journals like Marine Drugs and Journal of Cosmetic Dermatology has shown that certain peptides and polysaccharides from algae improve skin moisture retention and reduce redness caused by environmental stressors.

However, direct clinical evidence specifically attributing skin care benefits to isolated algal protein remains limited. Most available studies focus on algal extracts or whole-algae preparations rather than purified protein, and human trials are sparse. While the overall composition of algae suggests a potential for skin health, the evidence base is not robust, and more research is needed to confirm efficacy in humans. Thus, algal protein's use in skin care is supported by emerging but not yet strong scientific evidence, justifying a moderate rating.